Toolholder



Nov. 15, 1949 1.. F. CATLIN, sR.. ETAL 2,488,172

TOOLHOLDER Filed June 13, 1946 IN VEN TOR. 1.0013 R cATLIN 5R.

RAYMOND ROURKE L 015 E agnv JR.

1' BY e. l-

TTORNE Patented Nov. 15, 1949 TOOLHOLDER Louis F. Catlin, Sn, Raymond Rourke, and Louis F. Catlin, Jr., Shelton, Conn., assignors to Apex Tool & Cutter Company, Shelton, C0nn., a corporation of Connecticut Application June 13, 1M6, Serial No. 676,463

2 Claims. (01. 29-96) The invention relates to tool holders and tool bits, particularly designed for the metal working industries for use in machines such as lathes, boring mills, planers and the like.

It is among the general objects of the invention to provide simplicity and efiiciency in a bit and holder assembly, while precluding movement of the bit with respect to the holder and the consequent chattering and inferiority in the finish of the surface produced by the action of the bit upon the work.

Another important object of the invention is to provide a novel, simple and improved tool bit holder which will accommodate a simple straight tool bit whereby the bits may be of stock characteristics and readily interchangeable.

A further object of the invention is to provide a tool bit and holder assembly in which improved means are provided for securing the bit against accidental transverse movement with respect to the tool holder, thus insuring a rigid structure which will adequately withstand the cutting strains imposed by modern high speed machine tools.

The tool holder is generally characterized by the provision of a furcated and elongated tool body, which adjustably receives, within the furcation thereof, a tapered tool-seat, the upper face of which is serrated to bear against the under serrated face of the bit also received between the furcation and to be forced, by the tapered formation of the tool-seat, against the opposite face of the furcation.

The tool-seat is adapted to be drawn inwardly to apply the holding force upon the bit by means of a draw-bolt extending longitudinally through the holder or front locking bolt.

The invention is further characterized by the provision of a side wall carried by the tool seat and adapted to support the tool bit against transverse displacement due to cutting strains.

Other object features in the invention will be apparent from a consideration of the present specifications taken in connection with the accompanying drawing, in which:

Fig. 1 is a top plan view of a tool bit and tool holder assembly made in accordance with the present invention;

Fig. 2 is a side elevation of the structure shown in Fig. 1;

Fig. 3 is an end elevation;

Fig. 4 is a top plan detailed view of the drawbolt alone; and

Fig. 5 is a view similar to Fig, 2 showing a modification of the holder.

Referring more particularly to the drawing, the numeral l0 indicates the body of the shank of the tool holder, the forward end of which is furcated, including an upper furcation, or wall portion II, and a lower furcation, or wall portion I2. The tapered tool-seat is indicated by the numeral l3 and includes the serrations [4, which extend longitudinally of the holder.

The upper serrated surface of the tool seat I 3 is preferably formed at a slight transverse angle with respect to the tool holder body In and is provided at one side with a supporting wall or flange l5 which extends longitudinally of the body and extends upwardly from the lower side of the inclined surface of the seat l3. Longitudinally the surface of the seat I3 is parallel with the under surface of the wall II, so that upon inward adjustment of the bit seat the space between the bit seat and the wall II will be reduced to provide a locking action on the bit.

Such movement of the tool seat i3 is provided for either by the draw-bolt I6 shown in Figs. 1 to 4 or by a front locking bolt l 'l as shown in Fig. 5. Obviously other forms of seat adjusting means may be provided should alternates be desired.

The tool bit itself is indicated by the numeral l8 and consists of a simple elongated rectangular piece of tool steel which may be of carboloy or tipped with a suitable cutting edge brazed thereon. The edge [9 of the bit is preferably ground to a desired cutting angle and the bit is seated upon the tool seat 13 and is backed up against the inner wall of the side supporting flange I5, the transverse angularity of the seat l3 will insure a rigid seating of the bit whereby it is supported transversely as well as the usual longitudinal locking.

What we claim is:

1. A tool holder for a tool bit, having a shank and cutting head, comprising an elongated body having a bit retaining head formed by a pair of substantially parallel longitudinal furcations extending axially beyond the body and defining therebetween an axially directed opening across the end of the body, a wedge seat formed by the inner surface of one of said furcations, an overlying transverse bit engaging lip formed by the opposite furcation, a bit shank engaging wedge adjustably secured within said opening, a bit shank platform formed on said wedge movable with said wedge towards said lip to secure a bit shank between said platform and lip and a side flange on said wedge providing a longitudinally extending bit shank engaging face adjacent said 3 platform and extending at an angle therefrom towards the lip.

2. A holder as set forth in claim 1 in which the longitudinally extending bit engaging face of the flange is inclined with respect to a perpendicular 5 plane extending longitudinally of the body.

LOUIS F. CATLIN, SR. RAYMOND ROURKE. LOUIS F. CATLIN, JR.

REFERENCES CITED The following references are, of record in the file of this patent:

OTHER REFERENCES American Machinist, April 25, 1946, page 96. 

